HP Pavilion Power Desktop - 580-023w

[reevesma]

So I bought this machine used. The Graphics card and Hard drive have been removed. Everything else seems ok. I have an RX550 Graphics card that I put in to try and get it going. I did not get it to POST. I have pulled that card out and tried both of the HDMI ports built into the motherboard. They were under plastic covers. Still won't post but no CMOS Beeps. I tried another power supply and still nothing. I removed one stick of RAM. Moved it to the other slot then put both back in. I guess the million dollar question is do I need a hard drive to get this to post. I know I will need it to boot but I would expect it to post without it. I have downloaded the bios recovery from HP Support and created a USB recovery drive. I have put it into a slot and pressed the windows + b key then Power for 3 seconds and I get nothing. I have tried different RAM. I have moved the USB recovery media to different USB ports and I get no indication that it is even turning on. It has a red light on it when it is being read r wrote to. I did a CMOS clear and password clear with the jumpers and nothing. The only thing I am puzzled by is I have a jumper on the first two pins of ROM recovery. When I remove them the power button doesn't seem to work. I can't find this mentioned in the documentation. Was trying to get this going for my daughter to use. I may have wasted my money. I am usually pretty good at getting things like this to work but I get no input as to what is going wrong. IN a last ditch effort I removed the CPU and RAM and tried to power on to force a CMOS error and still nothing. This leads me to believe the MB is toast but thought I would ask the community since the recovery ROM pin jumper seems suspect. Any help would be greatly appreciated. 

[NonSequitur777]

@reevesma,

Welcome to our peer-to-peer HP Community Forum!

You said it as well as anyone -based on your detailed troubleshooting narrative: "This leads me to believe the MB is toast".

Another issue could be the power supply, though.  Since your motherboard is 24-pin ATX-power enabled, you could try out a different ATX power supply in order to rule out a power supply issue.

Anyway, your HP Pavilion Power 580-023w Desktop PC (Z5N95AA) as fitted with an Odense2-K motherboard (SSID: 82F1) with p/n: 862992-002 "Motherboard - Odense2-K, Intel KBL, H170". Btw, upgradeable up to an i7-7700K -but I digress.

Not with your particular model desktop, but I have been there, done that a few times, so to speak.

If the PSU is not the problem, what I would consider is to order a replacement motherboard from a trusted eBay seller, one who allows for returns (in case the same error repeat itself) such as this purchase example: https://www.ebay.com/itm/204631853333?epid=17011508025&itmmeta=01HPMMET83WVRCRMKZSGJHYA0Y&hash=item2....

Hope this was helpful.

Kind Regards,

NonSequitur777